Frequently Asked Questions

LINK BAND is a headband-style wearable that simultaneously measures EEG (brainwaves), PPG (heart rate), and ACC (motion) through three integrated biosensors, capturing brain activity, heart rate, heart rate variability (HRV), and movement in real time. Its 4-channel EEG samples at 250Hz, and the collected signals are processed by machine-learning algorithms that estimate your focus and relaxation states and deliver live feedback during meditation sessions. Raw sensor data is also accessible through the Web Bluetooth SDK for custom apps and research.

LINK BAND runs for up to 7 hours of continuous use on a single charge when measuring EEG alone, and lasts up to 72 hours in standby mode. A full recharge takes approximately 1 hour 30 minutes using the included pogo-pin cable. This capacity is enough to cover multiple meditation or research sessions in a single day without recharging, supporting everything from short daily check-ins to long data-collection sessions.

LINK BAND connects to iOS 15.0+ and Android 11.0+ devices over Bluetooth 5.0. Beyond the dedicated app, developers can integrate directly with the Web Bluetooth SDK, which exposes a JavaScript/TypeScript API and JSON, CSV, and Binary data formats. This makes LINK BAND both a consumer meditation tool and a programmable platform for building custom apps and research pipelines across mobile and the web.

Yes. LINK BAND is designed for users of every level, from complete beginners to experienced practitioners. A guided meditation mode walks first-time users through each step, while real-time feedback from the EEG and PPG sensors shows your focus and relaxation states at a glance. Because the headband automatically measures and interprets your biosignals, no prior meditation experience is needed to get started.

LINK BAND shipping takes 2-3 business days within Korea and roughly 5-10 days internationally, depending on the destination. Every order includes a tracking number that is emailed the moment your item ships, so you can follow its delivery progress. Delivery windows are counted in business days and may vary slightly around holidays or international customs processing.

You can request a refund within 30 days of receiving your LINK BAND. Defective products are refunded in full, while change-of-mind returns are processed based on the condition of the returned item. To start a refund, contact customer support with your order number; full terms and the step-by-step process are available on our refund policy page.

For corporate purchases, bulk orders, and volume quotes, reach out through the LINK BAND Business inquiry page and a dedicated representative will prepare a customized quote. Universities and research institutions can also buy multiple units for academic and research use. This channel handles procurement requests, tax invoicing, and partnership discussions that the standard single-unit checkout does not cover.

Yes, LINK BAND can be used for research. RAW EEG, PPG, and ACC sensor data along with HRV analysis results can be exported through the SDK in JSON, CSV, and Binary formats for offline analysis. The 4-channel EEG (250Hz) and synchronized PPG and ACC streams support studies across neuroscience, sleep, attention, and HCI. For research collaboration and dataset details, see our Research page.